Antisiphoning refill tube



Nov. 17, 1942. B. SVIRSKY ANTISIPHONING REFILL TUBE Original Filed Feb. 16, 1942 Patented Nov. 17, 1942 ANTISIPHONING REFILL TUBE REISSUE'D Bennett Svirsky, Glendale, Calif.

Original application February 16, 1942, Serial No. Divided and this application June 12,

1942, Serial No. 446,726

1 Claim.

This invention relates to an anti-siphoning reflll tube.

This application is a division of the disclosure made in my copending application for patent on ply line containing the latter; to provide a more compact and more easily made structure for the purpose just stated, and a structure the body portion of which consists only of partsWhich may be formed as a unitary casting; and to reduce the number and simplify the character of the liquid conducting passages andv ports required to carry out the purposes of the invention.

Other objects, advantages and features of invention will hereinafter appear.

Referring to the drawing wherein is shown a preferred embodiment of the invention as now reduced to practice:

Fig. 1 is a cross section of a toilet tank showing the installed device in a position for flushing.

Fig. 2 is an enlarged view partly in side elevation and partly in vertical midsection of the ball cock structure per se shown in Fig. 1, some portions being broken away in order to contract the view.

Fig. 3 is a transverse section taken on line 33 01' Fig. 2, a portion of the refill tube being included in the view.

Referring in detail to the briefly described views, the toilet tank 4 contains a body of water 5 which is discharged through the fixture 6 in a direction indicated by the arrow when the valve 1 is operated by means of a conventional trip lever through the medium of the lift 8 in the well known manner. An overflow pipe 9 connects with the fixture at a lower level than the seat of the valve 1 and into the mouth of said pipe is directed the free end of the refill tube Ill, the mouth of said tube being located preferably above the highest level of the body of water in the tank together with the body portion thereof, as will be presently more fully described.

A pressure source of water supply communicates with the tank 4, it being connected to the inlet pipe ii and the latter pipe sealed with the floor of the tank by means of the gasket washer l2. Into the annular recess Hr located in the the valve closes.

tracted lower end of the tubular valve cup IS, the outer diameter of said cup above said contraction being the same as that of the pipe I I and the upper part of said cup being externally screwthreaded and having screwed thereonto the tubular cap structure I.

The valve cup I3 is provided with a threaded inlet port I! in the transversely extending bottom portion thereof in axial alinement with the pipe II and into said port is screwed a tubular screw l6, by means of which the valve seat gasket washer i1 is secured to the bottom of the cup. In the wall of the cup ii at a pointslightly spaced above its point of sweating onto the pipe II is arranged a circumferentially spaced series of radially extending passages It.

The cap structure I 4 at a point adjacent its threaded union with the cup i3 is outwardly bulged thereby providing a semi-circularly shaped, circumferential passageway is into which the water discharges from the passages I8 and below said passageway said bulge terminates in a downwardly directed skirt 20 the inner periphery of which is slightly spaced away from the external periphery of the pipe I I thereby providing an annular channel 2| through which the water fiows from the passageway I9 into the tank.

The upper part of the cap structure It i diametrically contracted to form an axial tubular extension 22 and also to form a downwardly facing annular shoulder 23 which overhangs the space surrounded by the upper end of the valve cup [3. Within said valve cap is mounted a vertically slidable plunger valve 25, the upper part of which has a working fit within the tubular cap extension H. The lower portion of the plunger valve 25 which remains within the valve cup l3 during the operation of the device has a diametrically enlarged part 26 which forms an annular extension or broad circumferential rib therearound, this enlarged part having a cylindrical face that has a working fit within the valve cup I3. During the operation of the device the enlarged part 26 always remains above the passages l8.

The lower end of the plunger valve 25 has a central concavity?! and around said concavity a bevel 28, thus providing a definite circular edge for contacting with the valve washer I I when The concave recess 21 extends into the end of the plunger a suflicient distance safely to clear the head of the tubular screw l6 when the plunger valve is in the seated position.

At one side, on a level with its annular channel discharge end of the pipe II is sweated the con- IS, the tubular structure It is furnished with a lateral extension 3 I. A horizontally directed passage 32 extends from the channel l9 into said extension 3|, this passage having a contracted outlet 33 leading laterally from its outer end portion to discharge the water horizontally across an anti-siphoning gap 34 into a larger, horizontal passage 35 with which said outlet 33 is in axial alinement. With the opposite end of said passage 35 communicates the refill tube Ill.

The top of the overflow pipe 9 is positioned in the tank at a lower level than the cap structure l4 and therefore the entire cap structure, as well as the intake and delivery ends of the refill tube which leads horizontally therefrom, is maintained at all times above the water level.

The upper part of the tubular cap structure is provided with conventional oppositely disposed extensions 4| and 42 to which are respectively pivoted the float rod 43 and lever 44, the pivoted portions of said rod and lever being bifurcated so as to straddle the upper portions of said two extensions. The rod structure 43 carries a float 45 on one end and at its opposite end has bifurcations between which are pivoted the antifriction roller 46 which normally rests upon the free end of the lever 44. A regulating screw 41, carried by the mid-length portion of said lever 44 has its headed end directed upwardly and its lower end normally resting upon the top of the plunger valve 25.

Around the inlet pipe is loosely fitted a buoyant body 5l which rises and falls with the water level and its upper surface is always in the path of said downward stream. The force of this stream may slightly submerge said body at times. Said buoyant body will always function to cause said downward stream of water to merge in a noiseless manner with the body of water in the tank.

In the operation of the device the toilet tank 4 is flushed in the well known manner, at which time the valve controlling float means 45 drops as the body of water 5 in said tank is emptied through the discharge fitting 6. As the globular float 45 starts to fall the inlet means controlled by the plunger is irmnediately opened and water from the supply pipe ll starts flowing through the radial passages l8 into the passage- As a portion of the water flows through the channel 2| into the tank, other parts of the stream are directed through the lateral extension 3| through the reduced passage 33, squirts across the gap 34' into the terminal passage or port 35 and thence passes through the refill tube I0 into the overflow pipe 9 for the purpose of supplying in an economical manner the required amount of water to the conventional toilet trap below the tank. It will be seen that the outer extremity of the passage 32 is closed. and the port 33 communicates laterally with said passage in a, slightly inwardly spaced relation to its extremity, the cross section of said port being considerably less than that of the port of the passage from which it leads. As said port 33 alines axially with the larger passage 35, a drill may be inserted through the latter passage to drill the port to the predetermined size desired. The passage sections 32, 33 and 35 combine to form a horizontal L-shaped passage which may be conveniently include within a single casting having the lateral extension shown in Fig. 3 furnished with the vertical groove 34 which forms the required air gap. The air gap 34 prevents water at any time from being siphoned through the refill tube into the main supply line.

The operation of the remaining structure, not specifically alluded to, will be readily understood from the preceding detailed description.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the subject matter claimed.

What is claimed is:

In an anti-siphoning device of the kind described, a casting mountable upon the discharge portion of an upstanding supply pipe for a toilet tank, said casting having a lateral extension, there being an L-shaped horizontally extending passage within said extension of said casting, one limb of said L-shaped passage receiving a portion of the stream delivered from said casting and the other or outer limb thereof having across it an air gap formed by a recess or groove which extends transversely across the extension of the casting wherein the passage is formed, the part of the passage of said outer limb which is on the intake side of said air gap being of less diameter and axially in line with the remaining part of said outer passage, and a refill tube in communication with the outer part of said outer passage.

BENNE'I'I' SVIRSKY. 

